Question

ohmic heating, a thermal technology used to preserve food on an industrial scale, is generally considered to be an improvement over more conventional thermal preservation methods. scientists in latin america have contributed to a better understanding of this technology, with researchers from brazil demonstrating its effectiveness in preserving sugarcane juice. as research continues, scientists hope to make advancements in hybrid systems combining multiple food preservation technologies, which would be advantageous over using ohmic heating alone, given that it is especially vulnerable to technical breakdowns.
which choice best states the main idea of the text?
a there are possible flaws in ohmic heating technologies that have not yet been well researched and may impede future applications.
b hybrid systems of food preservation have been shown to be more effective than ohmic heating alone.
c much of the research into ohmic heating has been conducted in brazil, although research into the larger field of thermal processing technologies has been carried out around the world.
d ohmic heating is superior to conventional thermal preservation techniques, and future research may enable further improvements in food preservation technology that uses ohmic heating.

Explanation:

The text first states that ohmic heating is an improvement over conventional thermal preservation methods. Then it mentions contributions from Latin American scientists (specifically Brazilian researchers showing its effectiveness in preserving sugarcane juice). Finally, it talks about hopes for advancements in hybrid systems (combining multiple food preservation technologies) as research continues. Option D aligns with this as it says ohmic heating is superior (matches the first part) and future research may enable further improvements (matches the hybrid - systems and research - continuation part).
Option A: The text does not mention flaws in ohmic heating.
Option B: The text says scientists hope for hybrid systems, but it's not stated that they have been shown to be more effective yet.
Option C: The text is mainly about ohmic heating's superiority and future research, not about the location of research (Brazil) being the main focus compared to other thermal processing technologies.

Answer:

D. Ohmic heating is superior to conventional thermal preservation techniques, and future research may enable further improvements in food preservation technology that uses ohmic heating.